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US 5,489,416 AGranted
Heat-resistant, austenitic cast steel and exhaust equipment member made thereof
AssigneeHitachi Metals, Ltd.
InventorsNorio Takahashi, Toshio Fujita
Life of this patent
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Abstract
Exhaust equipment members are made of a heat-resistant, austenitic cast steel having a composition consisting essentially, by weight, of 0.1-0.6% of C, less than 1.5% of Si, 1% or less of Mn, 8-20% of Ni, 15-30% of Cr, 0.2-1% of Nb, 2-6% of W, 0.001-0.01% of B, 0.02-0.3% of S and/or 0.001-0.1% of REM (Ce, La, Nb or Pt), Mg or Ca, the balance being Fe and inevitable impurities.
Claims8
A heat-resistant, austenitic cast steel having a composition consisting essentially, by weight, of:
- C:
- 0.1-0.6%,
- Si:
- less than 1.5%,
- Mn:
- 1% or less,
- Ni:
- 8-20%,
- Cr:
- 15-30%,
- Nb:
- 0.2-1%,
- W:
- 2-6%,
- B:
- 0.001-0.01%,
- S:
- 0.02-0.3%, and
- At least one element selected from the group consisting of Ce, La, Nd, Pr, Mg and Ca:
- 0.001-0.1%, and Fe and inevitable impurities:
- balance.
18 more elements
A heat-resistant, austenitic cast steel having a composition consisting essentially, by weight, of:
- C:
- 0.1-0.6%,
- Si:
- less than 1.5%,
- Mn:
- 1% or less,
- Ni:
- 8-20%,
- Cr:
- 15-30%,
- Nb:
- 0.2-1%,
- W:
- 2-6%,
- N:
- 0.01-0.3%,
- B:
- 0.001-0.01%,
- S:
- 0.02-0.3%, and
- At least one element selected from the group consisting of Ce, La, Nd, Pr, Mg and Ca:
- 0.001-0.1%, and Fe and inevitable impurities:
- balance.
20 more elements
Dependencies are inferred from the claim text.